Safety-guard for stamping-presses.



JL M. JONES.. SAFETY GUARD FR STAMPING PRESSES. APPLIATIN TILD MAY 3.3,.1910. f n y I LG@ v L; @V59 Patented'oet. 10,1911

2 BHEETS*SHBET l.

J. M. JONES.

SAFETY GUARD FOR STAMPING PRESSES.

MPLIGATION FILED MAY 1a, 1010. l

1995????5 I Patented 0st. 10, 1911.

2 SHEETS-SHEET 2.

WMM/mw herrenl erstes JAMES -MELVN JU'S, 0F BUFFALO, NEW YORK,

Speecetionot Letters Patent.

retentedoet. 1e, 1911.

eppneanun mea may 13, 191e. Vserien No'. 561mg.

To at! whom it' may concern: Be 1t lmown that l, JAMns Mmmm Jones,

citizen of the l'leninion oftlsnads' residwget present et No. 4te- Henry street, But? in the county' of .ric and State ot New orlo here invented e. certain new und usefnl Safety s Geerd "for Stamping -j Presses; end il do ''1erehy,declere that the following :is e fell. cient, emot description ot the construction operation of the smne.

The invention relates to a. safety guard end mechanism to operate it, to be attached to stemping presses or machines othat eless where the `fingers of an operator menipnleting the seme7 ere in constant danger et i g caught in the machinery end Wounded or emputeted inerehy.

The invention consists et a safety attachment to machines of the class specified that is celculeted to prevent accidents to the operetortor the reason that the safety guard will not allow the mele die of the press to descend its :tull length et stroke to moet the lower die until the hand of the operator is ont of dehger es the guard, the clutch 1nechenism end the trendle ell 'operate together.

The invention further consists in a frame etteched to e stamping press, endrnechines of kindred nature where there is danger to -enoperetors htnd, such es power peper cntte'rs, power squering shears, box corner machines end such macl'nnes es ere operated by e foot treedle, the obgeet of my guard being to prevent the unlntching of the clutch (which allows `the mele die to drop) untilthe operetors hond is out of danger goosiu tion, and thus prevent his ilngels from heing .caught between the dies.

, l' attain these objects hy the mechanism illustrated in the accompanying drawing.

Figure i, represents one style of e stamp ing press with my guard and .operating mechanism attached, and the guard up or open. v Fig. 2, is simil-tr View, but shoufi-Lg the mele die up end 'the safety guard down to protect the front opening between the dies, l1nd so render it impossible for the operetors hand to get between the dies when the mele die descends. Fig. 2, is n. section of frame-lever, Vertical har, slotted` bracket and herd Ineta bushing in the slot of seid lever. Fig. Lt, is perspective View of the 'central frame and lever Attached.

Similar reference characters refer to similsr erts thronrfhout the several views.

vwhich is attached to the frame c,

A. represents one form of n stamping press, ot" which there areseverel kinds7 all of which can have my device attached' thereto reedilj, e small rectification only being required in some cases to he adapted to the peculiar malte' ofthe press.

The safety device mechanism consists of 'e triangular shaped frame o, termed ot' parte la 2, 3, which is provided with lugs e, d, by which it is" "'.olted on to the upper port of the press A. There is a, covered recess 5, forming a. slot in each of the said l. lugs d, 4, et the upper andlower front cor- `ners of thefreme c, into which is mede to slide tierticnllya smooth steel bei" 6, having attached et its lower' end e slotted brechet r', .into the slot of which is plecede horizontal guide 'ber 8, secured hy e' set screw i). @n the outer end of said bnry 8, is e slotted bracket 8, through which is made to pass an' ....H shaped sefety'rod 8, t0 the horizontnlportion of which is firmly secured e Wire screen 8, the two letter'perts forming essentially the safety guard `which is inode to operate up and own in front of the space between vthe dies for the operetors safety, after. y z

A lever 10, is pivotally attached to the rear end of the frame c, by e. pivot bolt 10, end its iront end attached to e slottedv bracket l1, on the vertical rod 6, and pivotelly secured to the seid lever 10, hy s screw bolt ll', mede to pass through n slot 11", in the said lever l0; by this lne-ens the iat ter is enabled to h-Ltve its 'forward end slide vertically onrthe perpendicular her 6', the reason of which will he shown hereinafter. The said lever l0, is elongated backward from its pivotal point to the rear of the treme c, and connected to said end is a vertical colnnectingr rod '15, which connects Vsaid eol es Will be more fully shnvn herein;V

lever 10, to the foot treafdle 16, through means of the intermediate foot cranks 15', at the bottom. The lower horizontal oer 13, by e set screw 3, and to the lever l0, by the Vertical connection 3, has' upon it a sliding bracket .GQ to which is pivotztlly connected a connecting rod T .the'npper end of Whichpesses through ehracket-l'?, and held thereon by set screw 18. another Shortlconnecting rod 7, has its lower end Ina-de to pass through the other end of the seid Ahrnclret 1T, and held thereto also by set screw; the upper Lov is held by the ing shaft 2,1.

' to pass ing rod the safety rod or guard bar 8, the leverv 10, of the frame c, and the lock or latch 19, and clutch 20, so that when these parts are properly adjusted relatively to one'another the male die a, cannot descend to the female die b, until the guard bar 8, is down in front of the space between the dies as far as it will descend, and even if the operators fingers accidentally or inadvertently get under the said guard bar, they will not-be injured more than giving him a little pinch,

as the clutch .20, will not release the latch 'and the male die llower die. It will thus if there is any object guard, treadle allow the male die a, to descend with force, until the guard bar reaches its lowest point, at which the latch descends with sufficient impact to stamp be observed that the released to trip the press under the guard bar suchas an operators hand, as all the parts, clutch and latch operate con jointly, so that if one part is prevented from moving, as by an obstacle being interposed in the path of the guard, none of the 'latch cannot be other parts can move.

'has its screw bolt 11, :a hard metal bushing 12, in

"" used to with aw here that the lever 10, made to pass through the slot 11, -to prevent'undue frictional -It may be observed on said lever, wear on said bolt.

with a series of bolt holes 22, which admits of finer adjustment of the stroke of the treadle to which it is attached. It will 'further be observed that, the guar-d bar 8,

attach a square of wire netting 8', to till the entire front space between the upper a, respectively, thus giving double security to the hands of the op' erator. j

The foot treadle 16 as shown is substair tially the same as' has been heretofore used on foot controlled stamping presses of the. class specified in which the treadle has been releases the clutchanything placed on the It may further be ob-A -served that the said lever 10, is provided the latch from the clutch to descend with die, a spring 23 the treadle after and allow the upper die great force on the lower being employed to raise release of the foot pressure. In the operation of such presses there is danger to the operator, if he is not extremely careful, of having his fingers caught between the dies and smashed, rendering the amputation of fingers or sometimes of the entire hand necessary; but with myV safety device, it is impossible for the operator to have his fin gers caught between the dies as on account of the aforesaid mentioned connections and safety device the latch 19, cannot be withdrawn from the clutch 20, until such time as the safety guard bar 8, moves downward to guard the space between the dies.

It may be observed that my safety guard device may worked or operated by a the locking and releasing merely requiring a slight modification of the safety parts which will not alter the essential features ofthe invention.

Having thus described my device and its advantages, what I claim as my invention and desire to secure by Letters Patent, is,

foot treadle to work l. In combination with a stamping press,

a safety guard attachment, comprising a frame securedY thereto, arod made to slide vertically in brackets attached to the frame, a lever pivotally attached at its rear end to said frame, and its front end secured to the said vertical rod, an adjustable horizontal safety rod carried by the lower endof the said vertical rod, and adapted to pass in front of the dies and meansto connect the said lever with the treadle and the latch of the operating clutch, forming a positive connection between the parts to lower the safety rod and guard opposite the space between the dies before the latch releases the clutch to cause `the male die to drop-th-us insuring safety to the operator.

2. In combination with a latch, clutch and treadle of a stamping press, an intermediate frame attached to the press, a lever pivotally secured to the said frame, its front end removably attached to a bracket, a rod made to slide vertically in brackets carried by theframe, a connection between the treadle and said lever and from said lever to the operating latch of the press for the purpose of preventing the latch from operating the clutch until the safety guard rod is moved down in front of the space -in front of the dies.

3. The combination with the latch and yclutchand treadle of a stamping press, of a safety guard attachment comprising a frame secured to the press, a rod sliding vertically in brackets on said frame, a guard carried by ,said rod. a bracket mounted on said wrlical rml. :i lever piruially mounted on said frauu: and rrouuwlrd to the treadle be adapted to all stamping presses latch, some presses l intieme I and latch of the press, a hard metal bushing carried by said bracket, said lever being4 Vformed with a slot in which said bushing is seated, said lever being formed with a plurality of pivot receiving holes whereby the fulcrum point of said lever may be varied.

.4. In combination with a stamping press,

' a frame, (c), bolted to the press, a vertical rod, (6.), made to slide vertically on the said frame, a safety horizontal guard bar, (8), slidably attached to the said vertical rod,

' (6), a' lever, (10), made to slide on the front vertical bar, (6), and its rear end portion pivotally attached to the rear of the triangular frame, (c), and connected to the treadle, (16), a horizontal bar, (13), having its front end attached to the lower portion of guard rod and screen 'vertically before/the dies, the said parte all operating simultaneously to prevent accident to the operator.

5. In combination with a stamping press, a frame, (c), carrying a vertical bar, (6), a horizontal guard device secured thereto, bars, (13, 3') secured to the frame, (3), and lever, (10), an adjustable connecting rod between the bar, (13), and the latch, (19), and connection, (15), between the said lever, (10), and the treadle, (16), by which .the male die, (e), cannot drop on the under die, (t), until the safety guard (8,) and screen, (8",) are down to their lowest point to cover the space between the dies, the mechanism operating simultaneously to prevent the latch from Withdrawal until the space rbetween the dies is protected.

Signed at Hamilton, Ontario, this th day of April, 1910.

J MELVIN ONES.

In the presence of- E. S. Grinsen?, W. BRUN. 

